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HP LaserJet Pro MFP M521 - Replace the ADF whole unit

Introduction

Before beginning
  • Use the table below to identify the correct kit part number for the product, and then go to www.hp.com/buy/parts to order the kit.
    Kit part number
    Description
    A8P79-65014
    ADF whole unit kit with instruction guide
Required tools
  • #2 Phillips screwdriver with a magnetic tip
  • Small flat blade screwdriver

Step 1 - Remove the Document Feeder

  1. Do the following:
    1. Turn off the product.
    2. Disconnect the power cable.
        warning:
      To avoid damage to the product, turn the product off, wait five seconds, and then remove the power cord before attempting to service the product.
  2. Slide the formatter cover toward the rear of the product to remove.
    Figure : Slide the formatter cover toward the rear of the product to remove.
  3. Remove one screw and release one tab.
    Figure : Remove one screw and release one tab.
  4. Remove the dummy cover.
    Figure : Remove the dummy cover.
  5. Open the rear door.
    Figure : Open the rear door.
  6. Gently pull down on the door and lower the door until it is fully open.
    Figure : Gently pull down on the door and lower the door until it is fully open.
  7. Push up on the link arm to release it.
      caution:
    The link arm is under spring tension. Do not let the link arm snap back toward the product when you release it.
    Figure : Push up on the link arm to release it.
  8. Remove two screws.
    Figure : Remove two screws.
  9. Open the lower-rear door, and then release one tab.
    Figure : Open the lower-rear door, and then release one tab.
  10. Release one tab.
    Figure : Release one tab.
  11. Rotate the bottom of the rear cover assembly away from the product.
    Figure : Rotate the bottom of the rear cover assembly away from the product.
  12. Pull down on the rear cover assembly to remove it.
    Figure : Pull down on the rear cover assembly to remove it.
  13. Remove one screw.
    Figure : Remove one screw.
  14. Grip the cover and pull it away from the product. Release the first tab (callout 1), and then release the second tab (callout 2). Release the third tab (callout 3), if necessary, to separate the cover from the product.
    note:
    The tab inside the tray cavity (callout 2) is located below the plastic tray rail. It might be easier to slightly lift up the left side of the product, and use a small flat-tip screwdriver to release this tab.
    Figure : Grip the cover and pull it away from the product. Release the first tab (callout 1), and then release the second tab (callout 2). Release the third tab (callout 3), if necessary, to separate the cover from the product.
  15. Disconnect 4 FFCs (callout 1), the FFC holder (held in place by 1 screw and 1 tab, callout 2), and 3 connectors (M521dw) or 2 connectors (M521dn) from the formatter PCA (callout 3).
    Figure : Disconnect 4 FFCs (callout 1), the FFC holder (held in place by 1 screw and 1 tab, callout 2), and 3 connectors (M521dw) or 2 connectors (M521dn) from the formatter PCA (callout 3).
  16. Feed the FFCs and connectors through their retainers.
    Figure : Feed the FFCs and connectors through their retainers.
  17. Disconnect one screw, and then remove the USB ground wire.
    Figure : Disconnect one screw, and then remove the USB ground wire.
  18. Remove one screw on the right side of the document feeder/scanner assembly.
    Figure : Remove one screw on the right side of the document feeder/scanner assembly.
  19. Remove one screw on the rear-right side of the document feeder/scanner assembly, and then remove the grounding screw on the rear-left side of the document feeder/scanner assembly.
    Figure : Remove one screw on the rear-right side of the document feeder/scanner assembly, and then remove the grounding screw on the rear-left side of the document feeder/scanner assembly.
  20. Remove one screw on the left-side of the document feeder/scanner assembly.
    Figure : Remove one screw on the left-side of the document feeder/scanner assembly.
  21. Slide the document feeder/scanner assembly back, and then pull up to remove.
    Figure : Slide the document feeder/scanner assembly back, and then pull up to remove.
  22. Carefully place the document feeder/scanner assembly upside down on a flat surface.
  23. Remove three screws, and then remove the scanner rear cover.
    Figure : Remove three screws, and then remove the scanner rear cover.
  24. Carefully separate the adhesive-backed FFC from the document feeder/scanner assembly and remove it from the channel beneath the scanner rear cover.
    Figure : Carefully separate the adhesive-backed FFC from the document feeder/scanner assembly and remove it from the channel beneath the scanner rear cover.
  25. Cut the plastic cable ties holding the wire harness to the document feeder/scanner assembly and remove it from the channel beneath scanner rear cover.
    note:
    Replace the cable ties to secure the wire harness when reinstalling the document feeder/ scanner whole unit.
    Figure : Cut the plastic cable ties holding the wire harness to the document feeder/scanner assembly and remove it from the channel beneath scanner rear cover.
    Figure : Cut the plastic cable ties holding the wire harness to the document feeder/scanner assembly and remove it from the channel beneath scanner rear cover.
  26. Place the document feeder/scanner assembly right-side up on a flat surface. Lift the document feeder assembly up and release two tabs.
    Figure : Place the document feeder/scanner assembly right-side up on a flat surface. Lift the document feeder assembly up and release two tabs.
  27. Lift the document feeder assembly up and carefully feed the FFC and wire harness through the slot in the scanner assembly to separate the document feeder assembly from the scanner assembly.
    Figure : Lift the document feeder assembly up and carefully feed the FFC and wire harness through the slot in the scanner assembly to separate the document feeder assembly from the scanner assembly.

Step 2 - Unpack the Replacement Document Feeder

Remove the replacement document feeder from the packaging.
If your part requires return or recycling, go to Product return and recycling.
Figure : Remove the replacement document feeder from the packaging.

Step 3 - Install the replacement document feeder

  1. Carefully place the scanner assembly on a flat surface.
  2. Lower the document feeder assembly into position and then carefully feed the FFC and wire harness through the slot in the scanner assembly.
    Figure : Lower the document feeder assembly into position and then carefully feed the FFC and wire harness through the slot in the scanner assembly.
  3. Position the document feeder hinges in the slots in the scanner assembly.
    Figure : Position the document feeder hinges in the slots in the scanner assembly.
  4. Carefully place the scanner assembly upside down on a flat surface.
    Figure : Carefully place the scanner assembly upside down on a flat surface.
  5. Attach the adhesive-backed FFC from the document feeder assembly into the channel beneath the scanner rear cover.
    Figure : Attach the adhesive-backed FFC from the document feeder assembly into the channel beneath the scanner rear cover.
  6. Thread plastic ties through the mounting points, and then attach the ties to the wiring harness.
    Figure : Thread plastic ties through the mounting points, and then attach the ties to the wiring harness.
  7. Install three screws, and then attach the scanner rear cover.
    Figure : Install three screws, and then attach the scanner rear cover.
  8. Install the document feeder/scanner assembly on the product chassis.
    Figure : Install the document feeder/scanner assembly on the product chassis.
  9. Attach one screw on the left-side of the document feeder/scanner assembly.
    Figure : Attach one screw on the left-side of the document feeder/scanner assembly.
  10. Attach one screw on the rear-right side of the document feeder/scanner assembly, and then attach the grounding screw on the rear-left side of the document feeder/scanner assembly.
    Figure : Attach one screw on the rear-right side of the document feeder/scanner assembly, and then attach the grounding screw on the rear-left side of the document feeder/scanner assembly.
  11. Attach one screw on the one screw on the right side of the document feeder/scanner assembly.
    Figure : Attach one screw on the one screw on the right side of the document feeder/scanner assembly.
  12. Attach the USB ground wire with one screw.
    Figure : Attach the USB ground wire with one screw.
  13. Feed the FFCs and connectors through their retainers.
    Figure : Feed the FFCs and connectors through their retainers.
  14. Connect four FFCs, the FFC holder (held in place by one screw and one tab), and three connectors (M521dw) or two connectors (M521dn) from the formatter PCA.
    Figure : Disconnect four FFCs, the FFC holder (held in place by one screw and one tab), and three connectors (M521dw) or two connectors (M521dn) from the formatter PCA.
  15. Attach the left cover tabs at the front of the product, and then rotate the left cover into position at the rear of the product
    Figure : Attach the left cover tabs at the front of the product, rotate the left cover into position at the rear of the product, and then attach the left cover tabs at the rear of the product.
  16. Grip the cover and pull it toward the product. Attach the first tab (callout 1), and then attach the second and third tabs.
    Figure : Grip the cover and pull it toward the product. Attach the first tab (callout 1), and then attach the second and third tabs.
  17. Attach one screw.
    Figure : Attach one screw.
  18. Attach the top of the rear cover, and the rotate the bottom of the rear cover into place.
    Figure : Attach the top of the rear cover, and the rotate the bottom of the rear cover into place.
  19. Open the lower-rear door, and then attach one tab on the left.
    Figure : Open the lower-rear door, and then attach one tab on the left.
  20. Attach one tab on the right.
    Figure : Attach one tab on the right.
  21. Attach two screws.
    note:
    These two screws are of different types. Make sure to install them in the correct location.
    Figure : Attach two screws.
  22. Attach the link arm.
    Figure : Attach the link arm.
  23. Close the rear door.
    Figure : Close the rear door.
  24. Position the dummy cover.
    Figure : Position the dummy cover.
  25. Attach one screw and one tab.
    Figure : Attach one screw and one tab.
  26. Slide the formatter cover toward the front of the product to install.
    Figure : Slide the formatter cover toward the front of the product to install.
  27. Do the following:
    1. Connect the power cable.
    2. Turn on the product.

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